<?php

/**
 * This is the model class for table "{{tag}}".
 *
 * The followings are the available columns in table '{{tag}}':
 * @property integer $tag_id
 * @property integer $tag_type
 * @property string $tag_name
 * @property integer $tag_frequency
 */
class Tag extends CActiveRecord
{
	const TAG_NEWS = 0;
	const TAG_PRODUCT = 1;
	/**
	 * Returns the static model of the specified AR class.
	 * @return Tag the static model class
	 */
	public static function model($className=__CLASS__)
	{
		return parent::model($className);
	}

	/**
	 * @return string the associated database table name
	 */
	public function tableName()
	{
		return '{{tag}}';
	}

	/**
	 * @return array validation rules for model attributes.
	 */
	public function rules()
	{
		// NOTE: you should only define rules for those attributes that
		// will receive user inputs.
		return array(
			array('tag_type, tag_name', 'required'),
			array('tag_type, tag_frequency', 'numerical', 'integerOnly'=>true),
			array('tag_name', 'length', 'max'=>128),
			// The following rule is used by search().
			// Please remove those attributes that should not be searched.
			array('tag_id, tag_type, tag_name, tag_frequency', 'safe', 'on'=>'search'),
		);
	}

	/**
	 * @return array relational rules.
	 */
	public function relations()
	{
		// NOTE: you may need to adjust the relation name and the related
		// class name for the relations automatically generated below.
		return array(
		);
	}

	/**
	 * @return array customized attribute labels (name=>label)
	 */
	public function attributeLabels()
	{
		return array(
			'tag_id' => 'Tag',
			'tag_type' => 'Tag Type',
			'tag_name' => 'Tag Name',
			'tag_frequency' => 'Tag Frequency',
		);
	}

	/**
	 * Retrieves a list of models based on the current search/filter conditions.
	 * @return CActiveDataProvider the data provider that can return the models based on the search/filter conditions.
	 */
	public function search()
	{
		// Warning: Please modify the following code to remove attributes that
		// should not be searched.

		$criteria=new CDbCriteria;

		$criteria->compare('tag_id',$this->tag_id);
		$criteria->compare('tag_type',$this->tag_type);
		$criteria->compare('tag_name',$this->tag_name,true);
		$criteria->compare('tag_frequency',$this->tag_frequency);

		return new CActiveDataProvider(get_class($this), array(
			'criteria'=>$criteria,
		));
	}
	
	public function insertTags($tags,$tag_type)
	{

		$tags = explode(',', str_replace('，', ',', $tags));
		
		foreach ($tags as $tag){
			
			//echo $tag;

//			$model = self::model()->findBySql("select * from {{tag}} where tag_name = '$data' AND tag_type = '$tag_type'");
			$model = Tag::model()->find('tag_name = :tag_name AND tag_type = :tag_type',array(':tag_name'=>$tag,':tag_type'=>$tag_type));
			//UtilTools::dump($model);
			if($model === null){
//				$this->tag_name = $data;
//				$this->tag_type = $tag_type;
//				$this->tag_frequency = 1;
				$tagModel = new Tag();
				$tagModel->tag_name = $tag;
				$tagModel->tag_type = $tag_type;
				$tagModel->tag_frequency = 1;
				$tagModel->save();
			}else{
				$model->tag_frequency++;
				$model->save();				
			}			
		}

	}
	
	private function changeFonts()
	{
		return 'font-size:'.rand(8, 24).'px; color:rgb('.rand(0, 255).','.rand(0, 255).','.rand(0, 255).'); padding:5px;';
	}
	
	public function generateTagLink($tag,$link='/info/tags')
	{
		$html = '';
		
		if($tag->tag_type == Category::CONTENT_STORY){
//			$html .= '<a href="'.Yii::app()->createUrl('info/tags',array('tag'=>urlencode($tag->tag_name))).'">'.$tag->tag_name.'</a>, ';
			$html .= CHtml::link($tag->tag_name,array($link,'tag'=>urlencode($tag->tag_name)),array(
				'style'=>$this->changeFonts()
			));
		}
		else
		{
			$html .= CHtml::link($tag->tag_name,array($link,'tag'=>urlencode($tag->tag_name)),array(
				'style'=>$this->changeFonts()
			));
// 			$html .= '<a href="'.Yii::app()->createUrl('tags',array('tag'=>urlencode($tag->tag_name))).'">'.$tag->tag_name.'</a>, ';
		}	

		return $html;
	}
	
	public function getTagsLink($tags)
	{
		$html = "";
		$tags = explode(',', str_replace('，', ',', $tags));
		foreach ($tags as $tag)
		{
			$html .= $this->generateTagLink($tag);
			
		}
		return $html;
	}
	
	public function tagsToLinks($tags, $uri,$htmlOptions = array())
	{
		$html = "";
		$tags = explode(',', str_replace('，', ',', $tags));
		foreach ($tags as $tag)
		{
			$html .= CHtml::link($tag,array($uri, 'tag'=>urlencode($tag)), $htmlOptions).'-';
			
		}
		
		$html = UtilString::strSlice($html, 0, UtilString::strlenUtf8($html)-1, 'utf-8', false);
		
		return $html;
	}
	
	
	
	public function generateTagsCloud($type = '', $limit = 50, $link='/info/tags')
	{
		$html = '';
		
		$criteria = new CDbCriteria(array(
			'order' => 'tag_frequency DESC',
			'limit' => $limit,		
		));
		
		if($type != '')
		{
			$criteria->addCondition('tag_type = '.$type);
		}	
			
		$tags = Tag::model()->findAll($criteria);
		

		
// 		UtilTools::dump($tags);
		
		foreach ($tags as $tag)
		{
			$html .= $this->generateTagLink($tag,$link);
		}
		
		return $html;
	}
	
	
	
	/**
	 * Returns tag names and their corresponding weights.
	 * Only the tags with the top weights will be returned.
	 * @param integer the maximum number of tags that should be returned
	 * @return array weights indexed by tag names.
	 */
	public function findTagWeights($limit=20)
	{
		$models=$this->findAll(array(
			'order'=>'frequency DESC',
			'limit'=>$limit,
		));

		$total=0;
		foreach($models as $model)
			$total+=$model->frequency;

		$tags=array();
		if($total>0)
		{
			foreach($models as $model)
				$tags[$model->name]=8+(int)(16*$model->frequency/($total+10));
			ksort($tags);
		}
		return $tags;
	}

	/**
	 * Suggests a list of existing tags matching the specified keyword.
	 * @param string the keyword to be matched
	 * @param integer maximum number of tags to be returned
	 * @return array list of matching tag names
	 */
	public function suggestTags($keyword,$limit=20)
	{
		$tags=$this->findAll(array(
			'condition'=>'name LIKE :keyword',
			'order'=>'frequency DESC, Name',
			'limit'=>$limit,
			'params'=>array(
				':keyword'=>'%'.strtr($keyword,array('%'=>'\%', '_'=>'\_', '\\'=>'\\\\')).'%',
			),
		));
		$names=array();
		foreach($tags as $tag)
			$names[]=$tag->name;
		return $names;
	}

	public static function string2array($tags)
	{
		return preg_split('/\s*,\s*/',trim($tags),-1,PREG_SPLIT_NO_EMPTY);
	}

	public static function array2string($tags)
	{
		return implode(', ',$tags);
	}

	public function updateFrequency($oldTags, $newTags)
	{
		$oldTags=self::string2array($oldTags);
		$newTags=self::string2array($newTags);
		$this->addTags(array_values(array_diff($newTags,$oldTags)));
		$this->removeTags(array_values(array_diff($oldTags,$newTags)));
	}

	public function addTags($tags)
	{
		$criteria=new CDbCriteria;
		$criteria->addInCondition('name',$tags);
		$this->updateCounters(array('frequency'=>1),$criteria);
		foreach($tags as $name)
		{
			if(!$this->exists('name=:name',array(':name'=>$name)))
			{
				$tag=new Tag;
				$tag->name=$name;
				$tag->frequency=1;
				$tag->save();
			}
		}
	}

	public function removeTags($tags)
	{
		if(empty($tags))
			return;
		$criteria=new CDbCriteria;
		$criteria->addInCondition('name',$tags);
		$this->updateCounters(array('frequency'=>-1),$criteria);
		$this->deleteAll('frequency<=0');
	}
}